On Tue, 28 Mar 2000, Mike Bilow wrote:
> On Tue, 28 Mar 2000, Jakob �stergaard wrote:
>
...
> > >From the CPU load on the raid-1 soft IDE test, I think seems likely that you
> > didn't have DMA enabled. Could that be possible ?
> >
> > It doesn't make sense to have 97% CPU load when reading with 4 MB/s unless
> > it's done with port I/O.
>
> I am not sure I agreed with that. Here is a test on a 166 MHz Pentium
> with a Triton PIIX IDE chipset:
>
> -------Sequential Output-------- ---Sequential Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
> 100 1835 98.2 6728 30.2 3301 34.1 1844 94.5 9390 41.8 173.3 5.7
>
> This machine is most certainly not using PIO:
No but it's a 166MHz Pentium meaning that the board has a RAM bandwidth of
probably 100MB/s at most - You're getting 10% of that with 40% CPU utilization,
and I think that's not too bad.
Now the machine in question was a PIII, probably with something like 800MB/s
RAM bandwidth. Such a machine should definitely _not_ show 97% CPU utilization
when doing a quarter of the bandwidth than your P166 does at 42% utilization.
--
................................................................
: [EMAIL PROTECTED] : And I see the elder races, :
:.........................: putrid forms of man :
: Jakob �stergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
